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What's the opposite of primitive?

Software Engineering Asked by dwjohnston on December 24, 2020

In java, int, byte and boolean are primitives, while String is not.

This can be contrasted with c where string is a primitive (essentially an array of chars).

What is the term for types that aren’t primitive?

2 Answers

The most general term (language agnostic) is a composite data type.

In Java there are several types of composite data type, the most obvious is a Class but an Enum would be another example.

A boxed type is another related term, which is a primitive wrapped in a class to provide an object oriented interface. Examples of this in Java are an int vs. an Integer or a char vs. a Character.

In java, int, byte and boolean are primitives, while String is not.

A String is actually a boxed type. Under the hood it's implemented as a char array just like C and you could use a char array too if you wanted. Obviously most people don't do this as you won't have any of the convenient abstractions provided by the String class.

Here's how the java.lang.String class is implemented in openjdk:

/** The value is used for character storage. */
private final char value[];

As you can see, there's nothing special about a string in Java.

Correct answer by thexacre on December 24, 2020

Composite Data Types (CDTs)

One answer to this question may be CDTs, but I don't think that is a general enough response. CDTs only account for a subset of non-primitive types: the definition of CDTs does not account for types that include methods. In fact, CDT is further misleading as they are expected to aggregate data, i.e., include fields. It is not a requirement for non-primitives to have fields.

User Defined Types (UDT)

There are ample examples of non-primitive non-UDTs, e.g., String in Java.

Reference Types

This doesn't help either. Consider that a pointer in C may point to anything, including primitive types.

Summary

As far as I am aware there is no general term for non-primitive types. Maybe except, as mentioned by @Doval, "non-primitive type".

Answered by David Poxon on December 24, 2020

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